CDPH Lead Inspector/Assessor California State Practice Exam

What should be used to collect soil samples?

1. Plastic ziploc bags or centrifuge tubes

2. Cardboard boxes

3. Glass test tubes

4. Wooden containers

The correct answer is: Plastic ziploc bags or centrifuge tubes

Using plastic ziplock bags or centrifuge tubes is the most appropriate choice for collecting soil samples due to their material properties and functionality. Plastic ziplock bags are flexible, airtight, and can be sealed securely, which helps in preventing contamination and moisture loss during transport. These bags allow for easy labeling and can hold various amounts of soil, making them versatile for different sampling needs. Centrifuge tubes, on the other hand, are designed to be airtight and can help in minimizing contact with potential contaminants, thereby preserving the integrity of the soil sample for analysis. They are particularly useful when collecting smaller amounts of soil or when precise measurements are required. In contrast, cardboard boxes are not sealed and can allow moisture and air exchange, potentially compromising the sample. Glass test tubes, while non-reactive, can be fragile and may not provide an adequate seal compared to plastic options. Wooden containers are not suitable either, as they may absorb moisture and contaminants, affecting the sample's integrity.